306 Evaluation of Fracture Strength by crack initiation and propagation on grain boundary in polycrystals

2006 ◽  
Vol 2006.55 (0) ◽  
pp. 123-124
Author(s):  
Takaaki SANO ◽  
Kazuaki TOYAMA ◽  
Hirohisa KIMACHI ◽  
Takashi IAI ◽  
Keisuke TANAKA ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Grain Boundary ◽  
Fracture Strength ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

scholarly journals Effect of Carbides and γ/γ' Eutectic on Crack Initiation and Propagation in Ni-based Superalloy

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Junwei QIN ◽  
Xiaohua CHEN ◽  
Kaixuan CHEN ◽  
Xinghai YANG ◽  
Weiyang XIE ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Grain Boundary ◽  
Induction Melting ◽  
Boundary Carbide ◽  
Crack Initiation And Propagation ◽  
Casting Method ◽  
Arc Melting ◽  
Initiation And Propagation ◽  
Tensile Process ◽  
Strain Hardening Rate

The Ni-based Udemit720Li superalloy tends to form large γ/γ' eutectic on grain boundaries (GBs) during solidification due to the addition of excessive Al and Ti elements, which provides convenience to study the effect of carbide and γ/γ' eutectic on crack initiation and propagation during tensile process. In this paper, Udemit720Li superalloy samples were prepared by induction melting casting method, arc melting and suction casting method. The microstructure, tensile properties and mechanism of crack initiation and propagation in Ni-based superalloy fabricated by two methods are investigated. The results exhibit γ/γ' eutectic accelerates the stress concentration at GB and thus leads to premature fracture failure. The samples with grain-boundary eutectic have higher strain hardening rate, but their cumulative and local misorientations are lower. For samples without eutectic at GB, the primary crack initiates at grain-boundary carbide along GB and extends along GB or into grain matrix, and exhibits better deformation performance and dislocation storage capacity within grains.

The Influence of Copper Addition on Crack Initiation and Propagation in an Al-Si-Mg Alloy During Cyclic Testing

2020 ◽  
Author(s):  
Toni Bogdanoff ◽  
Lucia Lattanzi ◽  
Mattia Merlin ◽  
Ehsan Ghassemali ◽  
Salem Seifeddine
Keyword(s):  
Crack Initiation ◽  
Mg Alloy ◽  
Cyclic Testing ◽  
Crack Initiation And Propagation ◽  
Copper Addition ◽  
Initiation And Propagation
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